Multiple Choice
Which of the following is false about activated carriers?
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3. Energy
Activated Carriers
Multiple Choice
ATP is a good source of energy for a cell because it:
A
can transfer a phosphoryl group to other molecules, coupling ATP hydrolysis to drive otherwise unfavorable reactions
B
releases energy mainly by breaking its high-energy bonds directly to produce heat for cellular work
C
acts as an electron carrier by accepting and donating electrons in redox reactions
D
is the most stable molecule in the cell and therefore stores energy indefinitely without being hydrolyzed
Verified step by step guidance1
Understand the role of ATP (adenosine triphosphate) in cellular metabolism as the primary energy currency of the cell.
Recall that ATP stores energy in the bonds between its phosphate groups, especially the bond between the second and third phosphate (the terminal phosphate bond).
Recognize that ATP releases energy not by simply breaking bonds to produce heat, but by transferring a phosphoryl group (a phosphate group) to other molecules, which can change their energy state and drive biochemical reactions.
Understand the concept of coupling: ATP hydrolysis (breaking down ATP to ADP and inorganic phosphate) is coupled to otherwise energetically unfavorable reactions, making them proceed by providing the necessary energy.
Eliminate incorrect options by noting that ATP is not primarily an electron carrier (that role belongs to molecules like NADH or FADH2), nor is it the most stable molecule storing energy indefinitely, and its energy release is not mainly through heat production.
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